So far both these KZ models interest me. I can get the ZS5 for $25. From what I've heard it has good bass which is one thing I am looking for. I can get the ZS10 for $43. Is the price difference worth it? What are the differences in these two IEMs quality wise? If you think another one of the KZ IEMs are better than these two, please let me know which one it is and why.